breathing and cause negative signal in the airway,send airflow synchronously, the intermittent auxiliary ventilation proceed.
(3) SPONT (spontaneous breathing): The work of ventilator is controlled y the patient’s spontaneous breathing. In all these

three basic models,all kinds of ventilator also have been designed respiratory function for a variety of diseases for your option.
E.g:
(a) PEEP (positive end expiratory pressure): based on mechanical ventilation,put a resistance to the airway at the end of expiration,

so that the pressure in the airway is maintained at a certain level.
(b) CPAP (continuous positive airway pressure): in the context of spontaneous breathing,impose a certain degree of positive

airway pressure artificially throughout the respiratory cycle, can prevent airway collapse.
(c) PSV (pressure support ventilation): under conditions of spontaneous breathing, each inhale accept a certain level of

pressure support.
(d) MMV (Mandantory Minute Ventilation): if SPONT ventilation per minute is less than a defined amount, the insufficient

part will supply by the cheap ventilator; if the ventilation volume of SPONT per minute is more than the limited quantity,

can be regarded as PSV+CPAP+PEEP.
(f) APRV (airway pressure release ventilation): in the state of CPAP, open the valve of low pressure to deflate,

reduce the airway pressure,and the ventilation formed.

2. Select the ventilation mode
After selecting the breathing mode,you should choose or you need to know the ventilation mode:
(1) Volume control ventilation(VCV): set a tidal volume,adjusted by flow rate × inspiration time.
(1) Pressure controlled ventilation(PCV): set a pressure,which is determined by the inspiratory plateau pressure.

3.Trigger mode selection:
(1) Pressure trigger: When the pressure inside the pipe reaches a certain limit, the breathing will be switched.
(2) Flow trigger: When the flow rate inside the pipeline reaches a certain limit, the breathing will switched.

Due to its high sensitivity,short delay time, it has been widely used.
(3) Time switch: controlled by time, once the set time is up, the breathing will be switched.

4.Alarm parameters option
All the parameters setting of the ventilator is interrelated, so we need to know the basic meaning and normal scope

of the various setting, in order to set the alarm parameters accurately. Physiological indicators for adult to use ventilator:

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